What is the percent of change in the cost of a pizza?

The percent of change in the cost of the pizza is _%.

20% increase

Step-by-step explanation:

Take the new price minus the original price

9-7.5 = 1.5

Divide the the original price

1.5/7.5 =.2

Multiply by 100%

20%

Since the price went up, it is a price increase

kk.bj.

step-by-step explanation:

.mnm.kn.kj

yes because there is exactly one y value for every x value

for function there can't be more than one value for every x value